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United States Patent | 5,148,807 |
Hsu | September 22, 1992 |
A non-contact, non-invasive tonometer utilizing the technique of angle modulation of high frequency sound waves or high frequency light waves to determine the intraocular pressure of an eye. The angle modulation technique can be either frequency modulation or phase modulation.
Inventors: | Hsu; Hsiung (Columbus, OH) |
Assignee: | Ohio State University (Columbus, OH) |
Appl. No.: | 574213 |
Filed: | August 28, 1990 |
Current U.S. Class: | 600/402; 600/400 |
Intern'l Class: | A61B 003/16 |
Field of Search: | 128/645,646,647,649,653,660.02,660.06,661.02,748,774,782 73/524,589,605,627 |
3763696 | Oct., 1973 | Krakau | 128/645. |
3948248 | Apr., 1976 | Zuckerman et al. | 128/676. |
4610255 | Sep., 1986 | Shimura et al. | 128/660. |
4819649 | Apr., 1989 | Rogers et al. | 128/660. |
4928697 | May., 1990 | Hsu | 128/649. |
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